K'Wipa was very responsive even late at night when I was still figuring out the front door. The place is super easy to find, though it was a bit of a struggle walking my luggage from the intersection along Asok - Din Daeng on the last stretch toward the hostel (the sidewalk isn't exactly in great condition).
I would definitely consider staying here again the next time I go to Bangkok. Should there be no vacancies, I'd still come back to properly try the drinks of the cafe on the ground floor!